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Net Income (Loss) Per Share - Summary of Potentially Dilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potentially dilutive securities not included in the calculation of diluted net loss per share 67,104 1,203,523 257,981 1,400,836
Employee Stock Options        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potentially dilutive securities not included in the calculation of diluted net loss per share 67,104 1,152,520 257,981 1,349,833
Warrants outstanding        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Potentially dilutive securities not included in the calculation of diluted net loss per share   51,003   51,003